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Does anybody know if this conversion is possible on an ammeter from an A-body with a rallye dash?



While it might be possible, I would guess not w/o a lot of work. Those gauges are an odd size and most "round" ones will not fit in the area and work well..

You know what you could do is use a factory oil/temp/etc... gauge and a voltage divider to lower the voltage to the correct range and use that...